PC-BSD 1.3 RC1 has been released. From the changelog: "Fixed icon size issues in KMenu; installer now does not display extended partitions; installer now can use empty primary partition space to install; fixed issue with BSDStats not properly reporting usage; fixed problem with 'Start' icon text not being translated properly; fixed issues when using installer to upgrade system from 1.2 to 1.3; closed numerous other issues from BETA2." Get it here.

Just to clear up confusion. The *BSD's create a partition for themselves that has to be a primary and then create slices inside said partition. So, you're still able to chop up your mount points, etc... inside the partition. All in all, it's a bit "cleaner", but I don't know if actually is technically better or worse then the Linux way of partitioning.